Move media/audio files into media namespace

media/audio/fake_audio_input_stream.cc

Index: media/audio/fake_audio_input_stream.cc
diff --git a/media/audio/fake_audio_input_stream.cc b/media/audio/fake_audio_input_stream.cc
index d5ba99409082a6778956abdf793543aa7dce14fe..47366a0b0c91f9626104d38f9998809338e31a69 100644
--- a/media/audio/fake_audio_input_stream.cc
+++ b/media/audio/fake_audio_input_stream.cc
@@ -10,6 +10,8 @@
 using base::Time;
 using base::TimeDelta;
 
+namespace media {
+
 AudioInputStream* FakeAudioInputStream::MakeFakeStream(
     AudioManagerBase* manager,
     const AudioParameters& params) {
@@ -93,3 +95,5 @@ void FakeAudioInputStream::SetAutomaticGainControl(bool enabled) {}
 bool FakeAudioInputStream::GetAutomaticGainControl() {
   return false;
 }
+
+}  // namespace media